12777491 has 2 divisors, whose sum is σ = 12777492. Its totient is φ = 12777490.

The previous prime is 12777473. The next prime is 12777497. The reversal of 12777491 is 19477721.

It is a strong prime.

It is an emirp because it is prime and its reverse (19477721) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12777491 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12777497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6388745 + 6388746.

It is an arithmetic number, because the mean of its divisors is an integer number (6388746).

Almost surely, 2^12777491 is an apocalyptic number.

12777491 is a deficient number, since it is larger than the sum of its proper divisors (1).

12777491 is an equidigital number, since it uses as much as digits as its factorization.

12777491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24696, while the sum is 38.

The square root of 12777491 is about 3574.5616514476. The cubic root of 12777491 is about 233.7842204468.

The spelling of 12777491 in words is "twelve million, seven hundred seventy-seven thousand, four hundred ninety-one".